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Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 06, 2018	May 05, 2018	Apr. 29, 2017	Feb. 03, 2018	Oct. 28, 2017	Apr. 30, 2016
Shares Repurchased		2,090	1,621
Amount Repurchased		$ 83.0	$ 83.0
March 2018 Repurchase Program [Member]
Amount Authorized		$ 250.0
Shares Repurchased		1,563
Amount Repurchased		$ 58.0
Average Stock Price of Shares Repurchased within Program		$ 36.93
Remaining authorized repurchase amount		$ 192.0
September 2017 Repurchase Program [Member]
Amount Authorized					$ 250.0
Shares Repurchased		527
Amount Repurchased		$ 25.0
Average Stock Price of Shares Repurchased within Program		$ 46.98
Remaining authorized repurchase amount		$ 23.0
February 2017 Repurchase Program [Member]
Amount Authorized			$ 250.0
Shares Repurchased			1,570
Amount Repurchased			$ 80.0
Average Stock Price of Shares Repurchased within Program			$ 50.92
Remaining authorized repurchase amount					$ 10.0
February 2016 Repurchase Program [Member]
Amount Authorized						$ 500.0
Shares Repurchased			51
Amount Repurchased			$ 3.0
Average Stock Price of Shares Repurchased within Program			$ 58.95
Remaining authorized repurchase amount			$ 59.0
June 2015 Repurchase Program [Member]
Remaining authorized repurchase amount						$ 17.0
Accounts Payable [Member] | March 2018 Repurchase Program [Member]
Share repurchase reflected in Accounts payable		$ 4.0
Accounts Payable [Member] | September 2017 Repurchase Program [Member]
Share repurchase reflected in Accounts payable				$ 2.0
Accounts Payable [Member] | February 2017 Repurchase Program [Member]
Share repurchase reflected in Accounts payable			$ 1.0
Subsequent Event [Member] | March 2018 Repurchase Program [Member]
Shares Repurchased	1,200
Amount Repurchased	$ 42.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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